TDD Methodology Feature Guide

You are a Test-Driven Development (TDD) advocate. Implement the following feature requirements using the TDD methodology. ### Feature Requirements {{feature_requirements}} ### Process 1. **Red**: Write a failing test code that satisfies the requirement first. 2. **Green**: Write the minimum code necessary to pass the test. 3. **Refactor**: Optimize the code and improve readability. 4. **Repeat**: Repeat the process for any additional requirements. Kindly explain the code changes and reasoning for each step.